Grease-cup plug



Aug. 18, 1925'.

M. F. M LAUGHLHN GREASE CUP PLUG- Filed Dec. 18, 1925 LI'Ny-a citizen of the United States, residing and State of Massachusetts, have invented ,fnew' andQufs e'ful Improvements inGreaseflCupr- Plug', of which the: followingis a "fspecification'fl J I a, 1' This invention relates to. grease-cups em- Y ';;p1oye'dtoco-nfine'a,lubricant, and particu- I" part of a I machine, such "as the connectings C 'ZQ ling-rod, connectingthe,drivingwheels of a i locomotive, the plugfi's often accidentally,

disengaged bythe moye ments ofthe cup.. "It is th object ofmy. invention tofprovide 1 i I simpleand efiectivenieans for confining" FF-the" plug in] such mannerf'as to prevent liability ofaccid'ental disengagement and Hi; lossof the s'ame, said meansbeing applicable toan existing plugiby a slight alteration of "the latter. w

apart of this specification,+f V V a a Figure .1 is'a sectional 'view of a grease- I ocu 'includin a plug embodying my in-\ v p I I p g I i i 7: such that whenthe plug is removed fiiom a sectional-view, showing the J 'Jvention.

,. g FigureJQ is i v plug removed from the cup- 7 y y The same reference characters indicate gthe'sameparts'in all ofthe figures.

Q A'grease-cup plug 12; embodying-"thepin Q; vention, has amale screw thread, adapted for-engagement with the female thread of ,qup carriedjby a moving part," such for" ,3 example, "as. a" portion 14 of'a locomotive.

' {connecting-rod, the cup being provided ,7 innerend arecess 15,- forming the internal .i surface of an, annular wa1l19, on which the V tengag'ingportion 16. The plug as thusjfar Ydescribed, is'a well" known adju' i eloc'omotive connecting-ro 1VE-FCQGGIK a euro s 'QETHESAID FRAN-Kr. COGGIN, pr ionasnn' I r GREASE-CUP P UG'. I i i a pucaiian flea-D cember 18,.19'2315' ial it). 681,377; g

".rotlliomhi 4 V Beitknown that I,*MILToN P. McLAUeH the plug by providi gfit Withfiitransv at T-Wakefield; in the county of Middlesex larlyiarelatively hard grease, on a moving;

'" jrod of a locomotive; o'r other part subjected A cup of this character is;

springing the confiningmember: into said recess, socketand orifice, so that its longer end portion 17,11ormally PlIOjGCtS IEIOm 'th Q gmale, screwthread and isa-dapted' to autos.

Y Ofythe accompanying drawings I t I r 'cess ively resisting the turning* of the plug a y Y jaacavity 13 formed inthe portion 14.5-

a f. The. plug 12jincludesa body havingat its male screwthread is formed,' and a wrench-i M'iiToN rQi/r jnAUGHLm; or wn z'arrnrn, Massnciiusia's'rs, assrenoa or. own- T11131 ro rnANKaoooGIN, or ivrnnrorm, ssAcHUsErrs, AND" ONE-THIRD ro :ri-rcrr- Alana wHIrcH an-F MnLRosE; ivmssacnusnrrsg JULIE vsooeemnnnrnanxj In carrying out "invention, ll mod;

Surface of said wall: aWithltheplug-thus;

modifiech'l combinea confining nien berfim ".cluding"a resilient b'owedportion l8,fhaving 'ashorte r end portion 17?, formed to engagej 5 the socket 20 and'a longer endiportion l 'i formed to I extend through and projectltrom the orifice '20; as shown "byrFigurefil The confining member is sprung intolthefrecessy. the socket 202 and they orifice 20,;andiis preferably made by bendingfarleng'th of suitably resilient wire, which maybebrass,

although steel or other wire may be iernployed. I The closed. end of the s'ocketQOf figwhich is: diametrically opposite theforifice' V 20, constitutes an abutment on which bearsthe} shorter end portion 17".- gThebowed-. f portion 18 is tensioned-by the operationof m'atic ally and yieldingly engage the female} 7 thread and ex'ert a liinited'pressure on the{ latter, at one. sideionly of theicplugflThis v limited pressure is suflicient; to prevent ac+ cidental rotation ofithe plug, withouteX-Y to "insert and removefit Theresiliencelof the'bowed portion 85 I the cup, the outer end of the endportion l'Z} i Projects outwardly from the male 'fihlea-df 'i o as shown by Figure 2. When the ,plug is screwed into the cup, asshown by Figure 1,

o force to prevent accidental rotation of th ,7 v p g, While permitting an unscrewing rot tionfthereo f by the application of consider-g1 able force. a,

" The-bowed portion 18 be compressed l by any suitable means tolpermit itsinsen I V tion in the cavity'15, said portion,when' re lease'dfinthe cavity, expanding-to engage i the confining member with thelorifice 2 07 and socket 20?, so that theconfiningmember a not ota securely held in its] operative posit-{101 5 The diameter Ofllhe wire-of Which thei confining member is made, is such that the end portion 17 presents a flat outer end face, adapted to bear on the apex of a female thread, in the portion 13, as shown by Figure 1. y

I claim:

The combination with a grease cup plug having a male screw thread adapted to engage a female thread on the wall of. a grease-containing cavity, and including a recess in its inner end and having a transverse orifice and a socket in the inner surface of the annular wall of said recess, of a plug-confining member composed of a metal rod including a straight end portion extending through said orifice and having an end fac adapted to extend across and bear on the apex of the said female thread, and a resiiient compressible bowed portion 'engaging the walls of the socket, the said MILTON P. MOLAUGHLIN. 

